Version 4
SHEET 1 952 680
WIRE -432 -96 -448 -96
WIRE -288 -96 -352 -96
WIRE -160 -96 -288 -96
WIRE 0 -96 -160 -96
WIRE 240 -96 0 -96
WIRE 320 -96 240 -96
WIRE 464 -96 400 -96
WIRE 528 -96 464 -96
WIRE 848 -96 624 -96
WIRE 864 -96 848 -96
WIRE 240 -48 240 -96
WIRE -448 -32 -448 -96
WIRE -288 -32 -288 -96
WIRE -160 -32 -160 -96
WIRE 576 -16 576 -32
WIRE 576 -16 464 -16
WIRE 576 32 576 -16
WIRE 576 48 576 32
WIRE 864 80 864 -96
WIRE -448 96 -448 32
WIRE -288 96 -288 32
WIRE -160 96 -160 32
WIRE 512 96 240 96
FLAG -448 176 0
FLAG 240 176 0
FLAG 576 144 0
FLAG 864 160 0
FLAG 848 -96 Vout
FLAG 576 32 Vctl
FLAG -288 176 0
FLAG -160 176 0
FLAG 0 -96 V_Load_Dump
SYMBOL voltage -448 80 R0
WINDOW 3 -99 161 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value EXP(0 202 2ms 10ms 0s 220ms)
SYMBOL zener 256 16 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value DFLZ33
SYMBOL res 224 0 R0
SYMATTR InstName R1
SYMATTR Value 25K
SYMBOL res 224 80 R0
SYMATTR InstName R2
SYMATTR Value 2K
SYMBOL npn 512 48 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL npn 528 -32 R270
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL res 848 64 R0
SYMATTR InstName R3
SYMATTR Value 360R
SYMBOL res 448 -112 R0
SYMATTR InstName R4
SYMATTR Value 1000
SYMBOL res 416 -112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 1R
SYMBOL voltage -288 80 R0
WINDOW 3 40 80 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 28.6
SYMBOL diode -272 32 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMBOL diode -432 32 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D3
SYMBOL res -336 -112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 2R
SYMBOL diode -176 -32 R0
SYMATTR InstName D4
SYMBOL voltage -160 80 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 55.3
TEXT -482 278 Left 2 !.tran 3s
TEXT -504 -152 Left 2 ;This simulates a Load Dump on a 24v System